✓ Zen Cortex supplement comes with a 100% money back guarantee – a full 60 days from original purchase. If you are not completely and completely satisfied with our product or its results, simply return the product, even empty bottles, at any time within 60 days of purchase, let us know by calling our toll-free number or emailing us email us, and you will receive a full, no-questions-asked refund (minus shipping and handling fees) within 48 hours of the product being returned.